Cummins/Onan — Type A Gaseous Fuel Adjustment (Naturally Aspirated)
Adjustments · Governor / fuel system
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan GGHE, Cummins/Onan GGHF, Cummins/Onan GGHG, Cummins/Onan GGHH
Before you start
- Gaseous fuels are flammable and explosive
Procedure
- Disconnect all loads, shut down set, and disconnect governor linkage at the carburetor.
- Start engine and hold throttle closed by hand to prevent overspeed.
- Adjust throttle idle position screw to obtain a frequency of 25-35 Hz.
- Turn idle adjusting screw counterclockwise until engine becomes unstable, then clockwise to regain stability.
- Reconnect governor linkage.
- Connect full rated load and turn main fuel valve to full-rich, then lean until engine loses speed, then back to rich.
- If equipped for LPG, switch to LPG and adjust LPG flow valve similarly under full load.
Specs & values
- Idle frequency 25-35 FridayParts $25.27 Hz
Full service-parts list: Cummins/Onan GGHE →, Cummins/Onan GGHF →, Cummins/Onan GGHG →, Cummins/Onan GGHH →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.